. Annals of the Entomological Society of America. Entomology. 1908] BiologicgI Notes on Potato Beetle 161 THE LARVA. I. Length of Instars. Observations on this point were not extended owing to the fact that it was impossible to make them continuous in time. Larvae hatching from 49 eggs (deposited at 2 p. M., May 31st, by pair No. 2 of the hibernated individuals) at 6 A. M., June loth, molted for the first time at 9 p. m., June 15th;, the time of other ecdyses not recorded. Forty-four larvae hatch- ing at 5 A. M., June 25th, molted for the first time at 6 a. m., June 28th, and for the second ti
. Annals of the Entomological Society of America. Entomology. 1908] BiologicgI Notes on Potato Beetle 161 THE LARVA. I. Length of Instars. Observations on this point were not extended owing to the fact that it was impossible to make them continuous in time. Larvae hatching from 49 eggs (deposited at 2 p. M., May 31st, by pair No. 2 of the hibernated individuals) at 6 A. M., June loth, molted for the first time at 9 p. m., June 15th;, the time of other ecdyses not recorded. Forty-four larvae hatch- ing at 5 A. M., June 25th, molted for the first time at 6 a. m., June 28th, and for the second time at 7 a. m., July i, but the time of the third ecdysis was not recorded. The following table shows the only complete observation made on the duration of the larval instars. table IIL Duration of Larval Instars for a Single Cycle. 2. Number of Ecdyses. The number of ecdyses recorded for fifty larvae during the season of 1907 was three (3), excluding pupation, and there were thus four distinct larval instars {Vide Girault, 1907). 3. Length of Stage. The duration of the larval stage was correctly determined for a few lots only; the observations on several others being interrupted at critical periods, thus des- troying accurac}'. The accompanying table summarizes. table IV. Duration of the Larval Stage for Three Cycles, 1907. 6 .-d Dura- tion ?0 «^fe t d o u c (U o o Q o 1 .30 Pair No. 2. Hibernated pairs. 5 a. m., June 25. 6 p. m., July 6. 11 13 2 21 Pair No. 1. 1st generation. Noon, August 3. 10 a. in., Aug. 14. 10 22 3 Pair No. 1, Hibernated pairs. 8 a. m., Aug. 30. 5 p. m., Sept. 11. 12 9 °. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of America. [College Park, Md. , etc. ] : Entomological Society of America
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